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gbj_tester in reply to @moocher
What do washers do?

For plain washers:
1. Act as a thrust bearing under the nut or bolt head to reduce friction. Less friction means lower tightening torque for a given desired bolt tension.
2. Act as a load transfer bridge to spread the nut or bolt head pressure over a greater area

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moocher in reply to @gbj_tester

2 is probably more relevant in my case. Thanks

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